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Ensure Filedropper.accepted_filetypes supports most extension types #8380

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Merged
philippjfr merged 3 commits into from
Jan 21, 2026
Merged

Ensure Filedropper.accepted_filetypes supports most extension types #8380

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d16bbb8
convert extension to mime type
maximlt Jan 21, 2026
4073c57
extend the mapping
maximlt Jan 21, 2026
6c2add5
Apply suggestion from @philippjfr
philippjfr Jan 21, 2026
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160 changes: 157 additions & 3 deletions panel/models/file_dropper.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,12 +37,167 @@ export class DeleteEvent extends ModelEvent {
}
}

// Mapping of file extensions to browser-reported MIME types
// as it's not yet supported by filepond, see:
// https://github.com/pqina/filepond-plugin-file-validate-type/issues/13
const EXTENSION_TO_MIME_TYPE: Record<string, string> = {
// Images
".png": "image/png",
".jpg": "image/jpeg",
".jpeg": "image/jpeg",
".gif": "image/gif",
".svg": "image/svg+xml",
".webp": "image/webp",
".bmp": "image/bmp",
".ico": "image/x-icon",
".tiff": "image/tiff",
".tif": "image/tiff",
".avif": "image/avif",

// Video
".mp4": "video/mp4",
".webm": "video/webm",
".mov": "video/quicktime",
".mkv": "video/x-matroska",
".avi": "video/x-msvideo",
".wmv": "video/x-ms-wmv",
".flv": "video/x-flv",

// Audio
".mp3": "audio/mpeg",
".wav": "audio/wav",
".ogg": "audio/ogg",
".oga": "audio/ogg",
".m4a": "audio/mp4",
".aac": "audio/aac",
".flac": "audio/flac",

// Text / documents
".txt": "text/plain",
".md": "text/markdown",
".rtf": "application/rtf",
".pdf": "application/pdf",

// Structured data (browser-compatible)
".json": "application/json",
".xml": "text/xml",
".csv": "text/csv",
".tsv": "text/tab-separated-values",
".yaml": "text/yaml",
".yml": "text/yaml",

// Web / code
".html": "text/html",
".htm": "text/html",
".css": "text/css",
".js": "text/javascript",
".mjs": "text/javascript",
".ts": "application/typescript",
".jsx": "text/jsx",
".tsx": "text/tsx",
".wasm": "application/wasm",

// Office documents
".doc": "application/msword",
".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
".xls": "application/vnd.ms-excel",
".xlsb": "application/vnd.ms-excel.sheet.binary.macroenabled.12",
".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
".ppt": "application/vnd.ms-powerpoint",
".pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
".odt": "application/vnd.oasis.opendocument.text",
".ods": "application/vnd.oasis.opendocument.spreadsheet",
".odp": "application/vnd.oasis.opendocument.presentation",

// Archives
".zip": "application/zip",
".tar": "application/x-tar",
".gz": "application/gzip",
".tgz": "application/gzip",
".bz2": "application/x-bzip2",
".xz": "application/x-xz",
".7z": "application/x-7z-compressed",
".rar": "application/vnd.rar",

// Fonts
".ttf": "font/ttf",
".otf": "font/otf",
".woff": "font/woff",
".woff2": "font/woff2",

// Executables / binaries
".exe": "application/vnd.microsoft.portable-executable",
".dll": "application/vnd.microsoft.portable-executable",
".bin": "application/octet-stream",
".dmg": "application/x-apple-diskimage",
".pkg": "application/octet-stream",
".deb": "application/vnd.debian.binary-package",
".rpm": "application/x-rpm",

// Columnar / big data
".parquet": "application/octet-stream", // browsers do NOT emit application/parquet
".arrow": "application/octet-stream",
".feather": "application/octet-stream",
".orc": "application/octet-stream",

// Scientific / numerical
".npy": "application/octet-stream",
".npz": "application/octet-stream",
".mat": "application/octet-stream",
".h5": "application/octet-stream",
".hdf5": "application/octet-stream",
".zarr": "application/octet-stream",

// R ecosystem
".rds": "application/octet-stream",
".rda": "application/octet-stream",
".rdata": "application/octet-stream",

// Notebooks
".ipynb": "application/json",

// ML models / artifacts
".pkl": "application/octet-stream",
".pickle": "application/octet-stream",
".joblib": "application/octet-stream",
".onnx": "application/octet-stream",
".pt": "application/octet-stream",
".pth": "application/octet-stream",
".h5model": "application/octet-stream",

// Vector
".shp": "application/octet-stream",
".shx": "application/octet-stream",
".dbf": "application/octet-stream",
".geojson": "application/geo+json",
".gpkg": "application/octet-stream",

// Raster
".geotiff": "image/tiff",
".asc": "text/plain",
}

export class FileDropperView extends InputWidgetView {
declare model: FileDropper
declare input_el: HTMLInputElement
_file_pond: any | null = null
_transfer_in_process: string | null = null

private extensionsToMimeTypes(types: string[]): string[] {
return types.map(type => {
// MIME types, including wildcards like "image/*"
if (type.includes("/")) {
return type
}
// Guessing it's an extension
if (type.startsWith(".")) {
const lowerType = type.toLowerCase()
return EXTENSION_TO_MIME_TYPE[lowerType] || type
}
return type
})
}

override initialize(): void {
super.initialize()
const {previews} = this.model
Expand All @@ -61,7 +216,7 @@ export class FileDropperView extends InputWidgetView {
const {disabled, layout, max_file_size, max_files, max_total_file_size, multiple} = this.model.properties
this.on_change([disabled, max_file_size, max_files, max_total_file_size, multiple, layout], () => {
this._file_pond?.setOptions({
acceptedFileTypes: this.model.accepted_filetypes,
acceptedFileTypes: this.extensionsToMimeTypes(this.model.accepted_filetypes),
allowMultiple: this.model.multiple,
disabled: this.model.disabled,
maxFiles: this.model.max_files,
Expand Down Expand Up @@ -91,9 +246,8 @@ export class FileDropperView extends InputWidgetView {

override render(): void {
super.render()

this._file_pond = (window as any).FilePond.create(this.input_el, {
acceptedFileTypes: this.model.accepted_filetypes,
acceptedFileTypes: this.extensionsToMimeTypes(this.model.accepted_filetypes),
allowMultiple: this.model.multiple,
credits: false,
disabled: this.model.disabled,
Expand Down
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